3.0 Operation; Inverter Mode; Figure 3-1, Power Flow - Inverter Mode - Magnum Energy ME3112-U Owner's Manual

3.0 Operation

The ME Series inverter has two normal operating routines: Inverter mode, which powers your loads
using the batteries; and Standby mode, which transfers the incoming AC power (e.g., utility power
or a generator) to power your loads and to recharge the batteries. This inverter also includes an
extensive protection circuitry to shut down the inverter under certain fault conditions.
3.1

Inverter Mode

When the ME Series is fi rst powered up, it defaults to the OFF mode.
switch (see Figure 1-1, Item 1)
pressing this switch alternately turns the inverter off and on.
Inverter OFF – When the inverter is off,
loads, and the status
is connected and qualifi ed on the inverter's AC input, this AC input power will pass through the
inverter to power the AC loads. However, if this AC power is lost, the AC loads will no longer be
powered because the inverter is off.
When the inverter is turned on, it operates either by "searching" or "inverting", depending on the
connected AC loads.
Searching – When the inverter is fi rst turned on, the automatic Search feature is enabled. This
feature conserves battery power when AC power is not required. In this mode, the inverter pulses
the AC output looking for an AC load (e.g., electrical appliance). Whenever an AC load (greater
than 5 watts) is turned on, the inverter recognizes the need for power and automatically starts
inverting. When there is no load (or less than 5 watts) detected, the inverter automatically goes
back into Search mode to minimize energy consumption from the battery bank. When the inverter
is searching, the inverter's green LED fl ashes (medium fl ash – blinks once every second).
Info: The factory default value for the Search feature is 5 watts. It can be turned off or
adjusted from 5 to 50 watts using a remote display.
Inverting – When a load greater than 5 watts is connected to the inverter output, the ME Series
inverts the DC power from the battery and supplies 120 VAC power to your sub-panel. The
green LED fl ashes once every second (medium fl ash) to indicate it is inverting. The
the inverter can be inverting and
that are connected, and the capacity of the battery bank. Refer to Figure 3-1 to see the fl ow of
power from the DC input to the AC output while in the Inverter mode.
AC HOT 2 IN
AC HOT 1 IN
AC NEUTRAL IN
AC GROUND
DC
DC NEGATIVE
IN
DC POSITIVE
© 2017 Sensata Technologies
must be lightly pressed to turn the inverter on. Subsequently,
no power is used from the batteries to power the AC
LED will be off. If AC power from an external source (utility or generator)
providing power is directly related to the amount of AC loads
AC Hot
Transfer Relay
CB1 (30A)
AC
DC
FET Bridge
Figure 3-1, Power Flow – Inverter Mode
CB3
(optional)
(optional)
Neutral-Ground
Transfer Relay
Power Transformer
Operation
The momentary ON/OFF power
amount of time
INV
OUT
AC HOT 2 OUT
AC HOT 1 OUT
CB2
AC NEUTRAL OUT
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inverter's
0
VAC
120
VAC
120
VAC